add get pipenv from settings to getPipenv function (#914)

fully completes:
#912

Author: eleanorjboyd

src/managers/pipenv/pipenvUtils.ts

@@ -47,9 +47,9 @@ export async function clearPipenvCache(): Promise<void> {
     pipenvPath = undefined;
 }
 
-function getPipenvPathFromSettings(): Uri[] {
+function getPipenvPathFromSettings(): string | undefined {
     const pipenvPath = getSettingWorkspaceScope<string>('python', 'pipenvPath');
-    return pipenvPath ? [Uri.file(pipenvPath)] : [];
+    return pipenvPath ? pipenvPath : undefined;
 }
 
 export async function getPipenv(native?: NativePythonFinder): Promise<string | undefined> {
@@ -64,6 +64,14 @@ export async function getPipenv(native?: NativePythonFinder): Promise<string | u
         return pipenvPath;
     }
 
+    // try to get from settings
+    const settingPath = getPipenvPathFromSettings();
+    if (settingPath) {
+        pipenvPath = settingPath;
+        traceInfo(`Using pipenv from settings: ${settingPath}`);
+        return pipenvPath;
+    }
+
     // Try to find pipenv in PATH
     const foundPipenv = await findPipenv();
     if (foundPipenv) {
@@ -147,8 +155,8 @@ export async function refreshPipenv(
 ): Promise<PythonEnvironment[]> {
     traceInfo('Refreshing pipenv environments');
 
-    const searchUris = getPipenvPathFromSettings();
-    const data = await nativeFinder.refresh(hardRefresh, searchUris.length > 0 ? searchUris : undefined);
+    const searchPath = getPipenvPathFromSettings();
+    const data = await nativeFinder.refresh(hardRefresh, searchPath ? [Uri.file(searchPath)] : undefined);
 
     let pipenv = await getPipenv();